Some 200L of water per second gushes from Fosse Dionne, a natural spring near the centre of Tonnerre that was sacred to the Celts and whose vivid blue-green tint hints at its great depth. Legend has it that a serpent lurks at the bottom. Forming a picturesque backdrop behind the great circular pool are a mid-18th-century washing house, a semicircle of ancient homes and a steep forested hillside.
© bbsferrari/Getty Images/iStockphoto
Fosse Dionne
Yonne
Lonely Planet's must-see attractions
24.58 MILES
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Nearby Yonne attractions
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